View X-Atlas Observation

Observation ID	Observation Date	Target	Star Name	Object Class	Spectral Type	B-V Magnitude	RA (deg)	DEC (deg)	Exposure (s)
6	2000-09-11 22:05:13	AR LAC-1 ECLIPSE (1)	HD 210334	Variable of RS CVn type	G2IV+K0IV	0.7200	332.169990	45.742340	32093.99

Chandra Configuration for the Observation

Zeroth-Order Image

Zeroth-Order Events	Zeroth-Order Count Rate (cts/s)	Pileup
7646	0.2382	severe

The zeroth-order image for AR LAC-1 ECLIPSE (1)

Hardness Ratios and Quantiles

Hardness ratios and quantiles are calculated from the predicted ACIS-S or ACIS-I aimpoint spectra, as indicated.

Hardness Ratios
Aimpoint	HR₁ = (H-M)/(H+M)	HR₂ = (M-S)/(M+S)	HR₃ = (H-S)/(H+S)
ACIS-S	-0.531	0.131	-0.431
ACIS-I	-0.481	0.328	-0.181

S, M, and H represent the predicted total counts in the following passbands:

S: 0.3-0.9 keV

M: 0.9-1.5 keV

H: 1.5-8.0 keV

Quantiles
Aimpoint	Quantiles	25 %	25 % Error	50 %	50 % Error	75 %	75 % Error
ACIS-S	keV	0.825	0.006	0.986	0.007	1.248	0.007
ACIS-S	Q-norm	0.068	0.001	0.089	0.001	0.123	0.001
ACIS-I	keV	0.883	0.004	1.059	0.001	1.380	0.001
ACIS-I	Q-norm	0.076	0.000	0.099	0.000	0.140	0.000

Normalized quantiles (Q-norm) are defined as:

Q_x = (E_x - E_lo)/(E_hi - E_lo)

Where E_lo = 0.3 keV and E_hi = 8.0 keV.

Hardness Ratio plots and Quantile-based Color-Color Diagrams

X-Atlas Hardness Ratios and Quantiles Listing

Spectral Metrics

A series of line-line, line-continuum, and continuum-continuum ratios calculated from the high-resolution 1^st order MEG or LEG spectrum.

Line-Line Ratios
Ne X / O VIII	Ne2O Error	O VII(i) / O VII(f)	Oif Error	O VII(r) / O VIII	O78 Error	O VIII / Fe XVII	O8Fe Error	Mg XII / Fe XVII	Mg2Fe Error	Si XIV / Fe XVII	Si2Fe Error	S XV / Fe XVII	S2Fe Error
4.1791	2.3648	0.4132	0.7138	0.0593	0.0544	0.1682	0.0720	0.2913	0.1063	0.1791	0.0845	0.1315	0.0452

short line / cont

Line-Continuum & Continuum-Continuum Ratios
sl2c Error	long line / cont	ll2c Error	line / cont	l2c Error	cont long / cont short	cl2cs Error	cont long / cont med	cl2cm Error	cont med / cont short	cm2cs Error
0.0108	0.0006	0.0051	0.0004	0.0174	0.0009	0.0432	0.0001	0.0437	0.0001	85.7109	0.2921

X-Atlas Spectral Metrics Listing

Spectral Fits

Image File Missing: 2T xsmekal zeroth-order fit
Mewe-Kaastra-Liedahl 2-temperature fit of the low-resolution zeroth-order spectrum of AR LAC-1 ECLIPSE (1).
Warning: The zeroth-order spectrum may be subject to distortions from pileup.

Image File Missing: 2T xsmekal ACIS-S fit
Mewe-Kaastra-Liedahl 2-temperature fit of the predicted low-resolution ACIS-S Aimpoint spectrum of AR LAC-1 ECLIPSE (1). The predicted spectrum was scaled to 1500 counts.

Image File Missing: 2T xsmekal ACIS-I fit
Mewe-Kaastra-Liedahl 2-temperature fit of the predicted low-resolution ACIS-I Aimpoint spectrum of AR LAC-1 ECLIPSE (1). The predicted spectrum was scaled to 1500 counts.

Aimpoint	Model	nH (10²²/cm³)	nH error	kT (keV)	kT error	kT2 (keV)	kT2 error	Abundance (solar)	Abundance error	Flux (ergs/cm²/s)	Flux Emission Ratio (kT2/kT1)	Reduced Chi²	DoF
zeroth-order	xswabs*(xsmekal1+xsmekal2)	0.000		5.613		0.854		0.28		1.0499e-11	0.296575	1.46	255
ACIS-S	xswabs*(xsmekal1+xsmekal2)	0.043		1.616		0.806		0.32		1.99061e-13	1.44905	1.17	61
ACIS-I	xswabs*(xsmekal1+xsmekal2)	0.017		2.054		0.822		0.33		3.11016e-13	1.57573	1.29	63

X-Atlas Spectral Fits Listing

HETG Light Curve

GLvary
Odds	22.922
Prob.	1.000
Var. Index	9

HETG light curve for AR LAC-1 ECLIPSE (1), constructed from all ±1^st, ±2^nd, and ±3^rd order HETG events.

HETG HEG Spectrum

Image File Missing: High-Resolution 1st Order HEG spectrum of obsid 6

High-Resolution 1st Order HEG Spectrum for AR LAC-1 ECLIPSE (1)

HETG MEG Spectrum

Image File Missing: High-Resolution 1st Order MEG Spectrum of obsid 6

High-Resolution 1st Order MEG Spectrum for AR LAC-1 ECLIPSE (1)

X-Atlas Data Products

Spectral Data
PHA II	HEG ±1^st Order PHA	HEG ±1^st Order gARF	MEG ±1^st Order PHA	MEG ±1^st Order gARF	[Counts/s/Å] FITS	[Counts/s/Å] text	[ph/s/Å/cm²] FITS	[ph/s/Å/cm²] text

Standard Data Products (Cycle 06)
Aimpoint ARF		Aimpoint RMF
ACIS-S	ACIS-I	ACIS-S	ACIS-I

Retrieve observation data from the Chandra Data Archive: WebChaSeR

Target Preview